CVE-2026-2666
Published: 18 February 2026
Summary
CVE-2026-2666 is a medium-severity Improper Access Control (CWE-284) vulnerability in Mingsoft Mcms. Its CVSS base score is 4.7 (Medium).
Operationally, exploitation aligns with the MITRE ATT&CK technique Exploit Public-Facing Application (T1190); ranked at the 4.7th percentile by exploit likelihood (below the median); it is not currently listed in the CISA KEV catalog; a public proof-of-concept is referenced.
Threat & Defense at a Glance
Threat & Defense Details
Likely Mitigating ControlsAI
Per-CVE control mapping for this CVE has not run yet; the list below is derived from the weakness types (CWEs) cited in the NVD entry.
This control enforces ownership-based restrictions on portable storage device use, directly implementing access control over media insertion into organizational systems.
Hardware write-protect enforces access control on critical resources (e.g., firmware) independent of software state.
The access control policy and procedures directly mandate and enforce proper access control mechanisms across the organization.
Device lock enforces restricted access until re-authentication, directly reducing unauthorized use of active sessions.
Supervision and review of access control activities directly detects and remediates improper access configurations or usages.
Explicitly identifying and documenting actions permitted without identification or authentication enforces proper access control boundaries by defining justified exceptions.
By automatically labeling outputs with security attributes, the control supports attribute-based enforcement and reduces exploitability of improper access control weaknesses.
Associating and retaining security attributes with data directly supports enforcement of access control decisions across storage, processing, and transmission.
MITRE ATT&CK Enterprise TechniquesAI
Why these techniques?
Unrestricted file upload (CWE-434) in public-facing CMS template handler directly enables remote deployment of web shells for execution/persistence after exploiting the application.
NVD Description
A flaw has been found in mingSoft MCMS 6.1.1. The affected element is an unknown function of the file /ms/file/uploadTemplate.do of the component Template Archive Handler. Executing a manipulation of the argument File can lead to unrestricted upload. The attack…
more
can be launched remotely. The exploit has been published and may be used.
Deeper analysisAI
CVE-2026-2666 is a vulnerability in mingSoft MCMS version 6.1.1, affecting an unknown function in the file /ms/file/uploadTemplate.do within the Template Archive Handler component. The flaw enables unrestricted file upload through manipulation of the "File" argument, as documented in the CVE description published on 2026-02-18.
The vulnerability is exploitable remotely over the network with low attack complexity and no user interaction required, but demands high privileges (PR:H) from the attacker. Successful exploitation results in low impacts to confidentiality, integrity, and availability, yielding a CVSS v3.1 base score of 4.7 (AV:N/AC:L/PR:H/UI:N/S:U/C:L/I:L/A:L). It maps to CWE-284 (Improper Access Control) and CWE-434 (Unrestricted Upload of File with Dangerous Type).
Advisories referenced in VulDB (ctiid.346463, id.346463) and GitHub issues (chujianxin0101/vuln/issues/11) confirm the issue, noting that an exploit has been published and may be used by attackers. No specific patch or mitigation details are outlined in the provided references.
Details
- CWE(s)